1. Description of how light intensity affects the resistance of LDR: 

• As the light intensity increases, the LDR's resistance decreases.
  .

• As the light intensity decreases, the LDR's resistance increases.

    2. The electrical symbol for a light dependent resistor is:

    3. a) Central heating controller does not use LDR.

        b) Digital cameras use LDR.

        c) Burglar alarms use LDR.